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We can cut a torus along a simple, closed curve and it won't divide in two parts. See also...
In una delle attività laboratoriali proposte nella mostra "Uguali? Diversi!" al Festival ...
If we take a long and narrow rectangle and paste together the two shortest sides, we get a...
The pieces of this puzzle are hexagonal tiles, all decorated with three pulls of rope (two...
By identifying opposite sides of a rectangle, we get a torus. See also the interactive ani...
A surface whose border is a torus knot of type (4,3); here we can see an embedding in the ...
The theorem of classification of the surfaces states that any compact, connected, orientab...
The exhibition matemilano at the Museum of Science and Technology in Milan, September 2003...
In the section "Topology" of the exhibition matemilano there are some threads with magneti...
Se prendiamo una sfera "normale" nello spazio ordinario, il suo complementare e' fatto di ...